A STUDY ON VIBRO-ACOUSTIC ANALYSIS SYSTEM FOR SPACECRAFT DESIGN

摘要

This paper reports a study result on vibro-acousticanalysis system for spacecraft equipment panels.The purpose of this study is how to establish avibro-acoustic analysis for spacecraft design. Thevibro-acoustic analysis is firstly intended to be used inearly design phase, say, concept design or preliminarydesign phase. In this design phase, it is important topredict random vibration level at equipment interface onequipment panels in order to define mechanicalenvironmental conditions. The prediction is required tobe done in short time cycle in order to verify systemequipment layout design. Global responses ofequipment panels would be preferred rather thanpoint-wise and precise ones for which large scaleanalytical models and much efforts are necessary. Weselected Statistical Energy Analysis (SEA) as the mainanalytical method for this system because it is fit to thepurpose of this study. An experimental prediction basedon SEA method was also proposed in this paper. It canpredict random vibration level with less parameters.The well-established database of analytical parameters,I.e., damping loss factor, coupling loss factor, and so on,is a key element for this system. It is one of the mostcritical issues how to integrate the data accumulationactivities in routine work. We built up a scheme toderive the SEA parameters from spacecraft acoustictests.We also mention one of the applications ofvibro-acoustic analysis system. We propose how topredict the peak PSD values in a panel from the spatialmean square values calculated by SEA method.